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astro_func.cpp
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astro_func.cpp
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#include <iostream>
#include <fstream>
#include <cmath>
#include <cstring>
#include "stars.h"
#include <cstdlib>
using namespace std;
//--------------------------------------------------------------//
// Функция, которая возвращает температуру неба в направлении
// детектируемого пульсара на частоте 1.4 МГц.
// Основана на работе Dinnat et al., 2010
// Аргументы функции - галактическая долгота и широта пульсара
//--------------------------------------------------------------//
bool isNaN(double x) {
return x != x;
}
struct decl {
double quant;
};
double T_sky (double l, double b, TMap * T_copy) {
double alphaf, deltaf, res;
double alpha_int, alpha_frac, delta_int, delta_frac;
double N_deg;
double A_g [3][3], ecv[3], gal[3];
decl Tb;
//ifstream in_dec ("declination.bin", ios::binary);
//ifstream in_ras ("right_ascension.bin", ios::binary);
//ifstream in_Tb ("TbGal_tot_CasA1pix.bin", ios::binary);
A_g [0][0] = -0.0548755601367195;
A_g [0][1] = +0.49410942801324;
A_g [0][2] = -0.86766614895829;
A_g [1][0] = -0.87343709025327;
A_g [1][1] = -0.4448296298016944;
A_g [1][2] = -0.19807637370567;
A_g [2][0] = -0.48383501554722;
A_g [2][1] = +0.74698224450044;
A_g [2][2] = +0.4559837761713720;
//double l = 20./180.*pi, b = 50./180.*pi;
//cout<<l<<"\t"<<b<<endl;
gal[0] = cos(b)*cos(l);
gal[1] = cos(b)*sin(l);
gal[2] = sin(b);
memset(ecv, 0, sizeof(ecv));
for (int i = 0; i < 3; i++)
for (int j = 0; j < 3; j++) {
ecv[i] += A_g[i][j]*gal[j];
}
deltaf = asin(ecv[2]);
alphaf = atan2(ecv[1], ecv[0]);
deltaf*=180./pi;
alphaf*=180./pi;
if (alphaf<0) {
alphaf+=360;
}
//cout<<alphaf<<"\t"<<deltaf<<endl;
alphaf*=4.;
deltaf+=90.;
deltaf*=4.;
alpha_frac = modf (alphaf, &alpha_int);
delta_frac = modf (deltaf, &delta_int);
N_deg = 721*alpha_int;
N_deg += delta_int;
// in_dec.seekg(sizeof(tmp)*N_deg, ios_base::beg);
// in_dec.read((char*) &delta, sizeof(tmp));
// in_ras.seekg(sizeof(tmp)*N_deg, ios_base::beg);
// in_ras.read((char*) &alpha, sizeof(tmp));
// in_Tb.seekg(sizeof(Tb)*N_deg, ios_base::beg);
// in_Tb.read((char*) &Tb, sizeof(Tb));
res = T_copy->get_Tb(N_deg);
//cout<<l<<"\t"<<b<<"\t"<<res<<endl;
//res = Tb.quant;
return res;
}
double S_min (double l, double b, float sm, double dist, double w, double P, float DM, TMap * T_copy) {
double res, DM_0_parkes, DM_0_swinburne, delta_beam, tau_scatt;
double W_l_parkes, W_l_swinburne, S_min_Parkes, S_min_Swinburne;
double N_ch = 96, t_sampl_parkes = 250e-6, t_sampl_swinburne = 125e-6, nu = 1.4e3, delta_nu = 288e6; // nu and delta_nu should be measured in MHz in principle
double tau_sampl_parkes = 1.5*t_sampl_parkes, tau_sampl_swinburne = 1.5*t_sampl_swinburne;
double beta = 1.5, sigma = 8, T_rec = 21, Tb_sky, G = 0.64, N_p = 2, t_int_parkes = 2100.0, t_int_swinburne = 265.0; // G = 0.64 K/Jy
// tau_scatt = 1000.*pow(sm/292., 1.2)*dist*pow(nu, -4.4);
//if (dist<20)
//cout<<"DM - "<<DM<<", dist - "<<dist<<", DM/dist - "<<DM/dist<<endl;
//------------------------------------------------------//
// Lorimer et al. ArXiv:0607640
//------------------------------------------------------//
// tau_scatt = 0.154*log10(DM)+1.07*pow(log10(DM), 2.) - 7.;
// tau_scatt = pow(10., tau_scatt)/1.e3;
//------------------------------------------------------//
//------------------------------------------------------//
// Bhat, Cordes, Camilo et al. (2004)
//------------------------------------------------------//
tau_scatt = pow(10.0, (-6.46 + 0.154 * log10(DM) + 1.07 * pow(log10(DM), 2))) * pow((nu/1e3), -3.86)/1000.0;
delta_beam = exp(-pow(rand() * sqrt(2.0*log(2.0)) /rand_high_board, 2));
// delta_beam = 0.5;
Tb_sky = T_sky (l,b, T_copy);
DM_0_parkes = N_ch*t_sampl_parkes*pow(nu,3)/8299./(delta_nu/1.e6);
DM_0_swinburne = N_ch*t_sampl_swinburne*pow(nu,3)/8299./(delta_nu/1.e6);
W_l_parkes = sqrt(w*w + tau_sampl_parkes*tau_sampl_parkes + pow(t_sampl_parkes*DM/DM_0_parkes, 2) + tau_scatt*tau_scatt);
W_l_swinburne = sqrt(w*w + tau_sampl_swinburne*tau_sampl_swinburne + pow(t_sampl_swinburne*DM/DM_0_swinburne, 2) + tau_scatt*tau_scatt);
if (P > W_l_parkes) {
S_min_Parkes = delta_beam * beta*sigma*(T_rec + Tb_sky)/G/sqrt(N_p*delta_nu*t_int_parkes)*sqrt(W_l_parkes/(P-W_l_parkes));
S_min_Swinburne = delta_beam * beta*sigma*(T_rec + Tb_sky)/G/sqrt(N_p*delta_nu*t_int_swinburne)*sqrt(W_l_swinburne/(P-W_l_swinburne));
}
else {
S_min_Parkes = 1e9;
S_min_Swinburne = 1e9;
}
if (abs(b*180./3.1415926) >= 5.) {
res = S_min_Swinburne;
} else {
res = S_min_Parkes;
}
// cout << "S_min_Parkes -- "<<S_min_Parkes << ", S_min_Swinburne -- "<<S_min_Swinburne << endl;
if (isNaN(S_min_Parkes)) {
cout << "Debugging -- " << P - W_l_parkes << "\t" << P << "\t" << w << "\t" <<sqrt(tau_scatt*tau_scatt)<<endl;
cout << "DM -- "<<DM<<endl;
}
//res = min (S_min_Parkes, S_min_Swinburne);
return res;
}